This is the hard part. This is why more startups are done by youths - it's easy to find ambitious smart people in college. About 90% of the effort in starting a new business is finding a smart enough cofounder.

You'll have to bounce around a few places. Companies like Google, which has lots of smart people, are a good place to look. Freelancing is also a major option - you'll cycle through a lot of people who can handle the business side and eventually a few will surprise you.